![Banged my head many times trying to figure out why opening .PDF on my harddrive with firefox would open another download dialog, and not the PDF.js viewer. Then I noticed this. [win7][firefox30/31]. Banged my head many times trying to figure out why opening .PDF on my harddrive with firefox would open another download dialog, and not the PDF.js viewer. Then I noticed this. [win7][firefox30/31].](https://external-preview.redd.it/nrklp_ieh4TUIckhTGyvKA2rCgvH22tUcboogNSiPo0.png?auto=webp&s=d27e37899eb574b26e3041909c607d6482289b7d)
Banged my head many times trying to figure out why opening .PDF on my harddrive with firefox would open another download dialog, and not the PDF.js viewer. Then I noticed this. [win7][firefox30/31].
![Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox](https://img.informer.com/screenshots/1/1487_4.png)
Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox
![Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox](https://img.informer.com/screenshots/1/1487_6.png)